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136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
#include <r_types.h>
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#include <r_util.h>
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#if __WINDOWS__
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#include <windows.h>
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#include <stdio.h>
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#ifndef __CYGWIN__
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#include <tchar.h>
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#endif
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#define BUFSIZE 1024
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void r_sys_perror(const char *fun);
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#define ErrorExit(x) { r_sys_perror(x); return NULL; }
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static int CreateChildProcess(const char *szCmdline, HANDLE out);
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char *ReadFromPipe(HANDLE fh);
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// HACKY
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static char *getexe(const char *str) {
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char *ptr, *argv0 = strdup (str);
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ptr = strchr (argv0, ' ');
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if (ptr) *ptr = '\0';
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argv0 = realloc (argv0, strlen (argv0)+8);
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strcat (argv0, ".exe");
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return argv0;
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}
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R_API char *r_sys_cmd_str_w32(const char *cmd) {
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char *ret = NULL;
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HANDLE out = NULL;
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HANDLE in = NULL;
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SECURITY_ATTRIBUTES saAttr;
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char *argv0 = getexe (cmd);
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// Set the bInheritPlugin flag so pipe handles are inherited.
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saAttr.nLength = sizeof (SECURITY_ATTRIBUTES);
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saAttr.bInheritHandle = TRUE;
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saAttr.lpSecurityDescriptor = NULL;
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HANDLE fh;
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// Create a pipe for the child process's STDOUT.
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if (!CreatePipe (&fh, &out, &saAttr, 0))
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ErrorExit ("StdoutRd CreatePipe");
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// Ensure the read handle to the pipe for STDOUT is not inherited.
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if (!SetHandleInformation (fh, HANDLE_FLAG_INHERIT, 0) )
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ErrorExit ("Stdout SetHandleInformation");
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CreateChildProcess (cmd, out);
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in = CreateFile (argv0,
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GENERIC_READ,
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FILE_SHARE_READ,
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NULL,
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OPEN_EXISTING,
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FILE_ATTRIBUTE_READONLY,
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NULL);
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if (in == INVALID_HANDLE_VALUE) {
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eprintf ("CreateFile (%s)\n", argv0);
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ErrorExit ("CreateFile");
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}
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// Close the write end of the pipe before reading from the
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// read end of the pipe, to control child process execution.
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// The pipe is assumed to have enough buffer space to hold the
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// data the child process has already written to it.
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if (!CloseHandle (out))
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ErrorExit ("StdOutWr CloseHandle");
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ret = ReadFromPipe (fh);
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free (argv0);
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return ret;
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}
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static int CreateChildProcess(const char *szCmdline, HANDLE out) {
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PROCESS_INFORMATION piProcInfo;
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STARTUPINFO siStartInfo;
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BOOL bSuccess = FALSE;
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ZeroMemory (&piProcInfo, sizeof (PROCESS_INFORMATION) );
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// Set up members of the STARTUPINFO structure.
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// This structure specifies the STDIN and STDOUT handles for redirection.
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ZeroMemory (&siStartInfo, sizeof (STARTUPINFO) );
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siStartInfo.cb = sizeof(STARTUPINFO);
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siStartInfo.hStdError = out;
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siStartInfo.hStdOutput = out;
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siStartInfo.hStdInput = NULL;
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siStartInfo.dwFlags |= STARTF_USESTDHANDLES;
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bSuccess = CreateProcess (NULL,
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(LPSTR)szCmdline,// command line
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NULL, // process security attributes
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NULL, // primary thread security attributes
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TRUE, // handles are inherited
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0, // creation flags
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NULL, // use parent's environment
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NULL, // use parent's current directory
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&siStartInfo, // STARTUPINFO pointer
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&piProcInfo); // receives PROCESS_INFORMATION
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if (bSuccess) {
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CloseHandle (piProcInfo.hProcess);
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CloseHandle (piProcInfo.hThread);
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} else r_sys_perror ("CreateProcess");
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return bSuccess;
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}
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char *ReadFromPipe(HANDLE fh) {
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DWORD dwRead;
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CHAR chBuf[BUFSIZE];
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BOOL bSuccess = FALSE;
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char *str;
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int strl = 0;
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int strsz = BUFSIZE+1;
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str = malloc (strsz);
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for (;;) {
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bSuccess = ReadFile (fh, chBuf, BUFSIZE, &dwRead, NULL);
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if (! bSuccess || dwRead == 0) break;
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chBuf[dwRead] = '\0';
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if (strl+dwRead>strsz) {
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strsz += 4096;
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str = realloc (str, strsz);
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if (!str)
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return NULL;
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}
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memcpy (str+strl, chBuf, dwRead);
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strl += dwRead;
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}
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str[strl] = 0;
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return str;
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}
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#endif
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